Excellent shots. The second one is the stronger for me - you have demonstrated good attention to detail with the composition - but you could do better. I'd crop it such that the church is exactly centered, and straighten the image too as it is a little crooked.

The first image is very nice, and has some great colours and tones - however, the bunch of leaves at right is cut off. You'd do better to include them entirely, or remove them entirely. For example, a photograph of just the rocks to the left of the frame and the leaf stuck in the water would be very strong in its own right.

The first image is a little bright but it's not overexposed - except for a small area in the waterfall there is detail in all the highlights. The previous poster's advice to use a ND filter to prevent overexposure is not necessarily true - a faster shutter speed or a smaller aperture (higher f-number) would have darkened the image just fine. I would suggest darkening it in your favourite photo editor a bit - it is a bit too bright aesthetically.

ND filters do cut the light coming into the camera, but in autoexposure the camera will simply lengthen the shutter speed or widen the aperture to compensate, leaving you with a bright image again. I have photos taken in the middle of the night where the image is overexposed!